Hopefully this thread will be a clearing house on everything HD-558 (and now also the HD518 & HD598)
(I just ordered the HD-558s last night and the cans should be arriving on Monday.)
People can post comparisons of their HD-558 verses other headphones (and other Sennheisers) they use.
Post Ideas for any mods for the HD-558.
Find out which headphone amplifiers bring out the best of the HD-558s.
Figure out which EQ settings bring out the best for movies, music, games, etc.
So just anything to do with the HD-558 (and also HD518 & HD598).Edited by PurpleAngel - 11/12/14 at 5:08pm

Just take out the black rubber tape, cut off one third of the tape and put the 1/3 piece back in.

wait, just to clarify, ur talking bout the foam mod right? if so the foam mod works (if my logic is right) by allowing the drivers to get more air (which should explain the increase in bass) but the foam piece also restricted some of the driver's movements so with that gone, it can move more (should explain the bass gain and/or the control loss) so it may work